L2cap: Cancel Sm4 timeout after security complete

Issue:
stack rejecting incoming Profile connection if remote delayed
information responce

Steps:
Pre-condition:
===========
RD2 in paired list

1. Pair and connect RD1.
2. Initiate music streaming.
3. Power on RD2.

Actual Result:
DUT incoming profile connection with refused-PSM not supported to
incoming RD2 connection

Expected result:
Incoming connection from RD2 should be successful.

RootCause:
When DUT receives incoming connection from remote device, stack starts
Security manager timer.on security complete , stack restarts the timer
with channel connection timeout timer if information response received
from remote. But if any IOT remote takes more than 2 sec to give
information response , stack security timer expires and stack
rejecting incoming connection.

Stack should stop the security manager timeout after connection complete

Fix:
cancel Sm4 timeout after security complete

Test:
Verified with above steps

Bug: 161517455
Change-Id: Ib3de15d3b17f1e3eb832724e0bd9410fada45a46